To provide an interface apparatus capable of achieving noncontact and unrestricted arm pointing actions of multiple users in an indoor space, and facilitating the recognition of all typical arm pointing actions in standing, sitting, and lying postures and the operation of indoor units in the indoor space by the arm pointing actions. In the instruction code, a plurality of operations corresponding to a common calculation pattern are represented by a common instruction set designating logical registers. The medical lumen access device assembly also includes a medical lumen access device disposed at least partially within the lumen and having a proximal segment extending beyond the distal opening. The latency may then be adjusted by adjusting the size of a packet queue based on more accurate interpacket delay statistics.